Quote:
Originally Posted by mrnickleye
^^^ This is true. But...7mge has 9.2 compression. You can run regular 87 octane under normal conditions, when the outside air temp is below 100*. The knock sensor will let the computer know if your getting any pinging, and it will back down the timing to stop the pinging, which is HP loss.
I've never heard it pinging, no matter what fuel I use.
In the summer it gets over 100* here most days. My a/c is on, day and nite, so I run 89 octane to keep the pinging away, and my timing advanced, thus keeping my HPs up.
I can tell the power difference between 87 and 89. Can't tell any between 89 and 91, so I must not be getting any timing retard with the 89.
BTW...I run my timing at 15*.
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what about from 87 to 94 octane, would u notice a difference? Here it doesnt cost much more, and at some stations 90 octane is considered regular :S